Worldwide Church of God, Adventist church founded in 1933 as the Radio Church of God by Herbert W. Armstrong (1892–1986), an American newspaper advertising designer. Until the mid-1990s the church taught a non-Trinitarian theology, held Saturday worship services, and preached the imminent return of Jesus Christ.

Armstrong’s study of the Bible led him to conclude that it was the inspired word of God, that Jewish holy days, festivals, and dietary restrictions (Leviticus 11) should be observed, and that the Sabbath should be honoured on Saturday. He joined a branch of the Church of God (Seventh Day) that practiced Sabbatarianism (Saturday worship), and soon afterward he adopted British Israelism, the notion that the Anglo-Saxon people are the descendants of the biblical Ten Lost Tribes of Israel. In 1933 he established an independent radio ministry in Eugene, Ore., the Radio Church of God, and a magazine, The Plain Truth, to disseminate his ideas.

In 1947 Armstrong moved to Pasadena, Calif., where he oversaw the continued growth of the church and changed its name to the Worldwide Church of God. Along with British Israelism and anti-Trinitarianism, Armstrong also taught that members of his church should not vote, serve in the military, remarry after divorce, or celebrate Christmas, Easter, or birthdays. In the 1960s he established a television ministry, The World Tomorrow, which specialized in biblical interpretations of contemporary events and featured his son, Garner Ted Armstrong. Although Herbert Armstrong offered the magazine and all of his teaching literature for free, he accepted donations and expected his followers to pay a tithe for the general support of the church. His financial supporters formed the core of the church, which grew to more than 100,000 members by the time of Armstrong’s death.

Problems plagued the church during the 1970s. Garner Ted Armstrong left the church after being accused of sexual immorality. Church ministers advocated an easing of strict dietary rules and fiercely debated the question of marriage after divorce. Authorities in California briefly turned the church over to a receiver following accusations of financial mismanagement, and critics branded it a cult.

Joseph Tkach (died 1995), Armstrong’s appointed successor, became head of the Worldwide Church of God following the founder’s death. Tkach began to move the church toward mainstream Christianity, a process that his son and successor, Joseph Tkach, Jr., carried to its logical conclusion. By the late 1990s the church had dropped all of Armstrong’s unique doctrines, including his British Israelism and his non-Trinitarian theology. After adopting orthodox Christian beliefs, the church was admitted to the National Association of Evangelicals in 1997. The change caused several of the church’s leading ministers to found rival churches based on Armstrong’s original teachings. In the early 21st century the church claimed some 64,000 members in 90 countries around the world.

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